Nicko, Sheer Cold is by far one of the most inefficient moves out there, but it and Fissure are some of the more advantaged one-hit KO attacks (Fissure can hit Pokémon using Dig, and Sheer Cold can hit Pokémon of any type). It has a base accuracy of 30 percent, and this hit rate increases against weaker Pokémon but by that time the Pokémon's other moves should have sufficient power to subdue those Pokémon. On top of that, it can't hit higher level Pokémon, but its three brethren could in the Red, Blue, and Yellow versions (yet there were afflicted by the accuracies' abysmalities).